Katanas are typically designed to be wielded with two hands. While they can be used with one hand in certain situations or for specific techniques, the traditional and most effective method of wielding a katana is with a two-handed grip.

The length and weight distribution of a katana are optimized for a two-handed grip, which provides greater control, balance, and power during strikes. The grip of the katana's hilt is designed to accommodate both hands comfortably, allowing for proper technique and leveraging the full potential of the sword.

Using a two-handed grip on a katana allows the wielder to generate more force, control the direction of the blade more precisely, and execute various cutting and blocking techniques with greater efficiency. The second hand provides stability and additional control, which is particularly important during powerful strikes and defensive maneuvers.

That being said, there are certain techniques or situations where a one-handed grip on a katana can be employed. These may include close-quarters combat, quick and agile movements, or situations that require more dexterity and maneuverability. However, the majority of katana techniques and styles are designed with a two-handed grip in mind.

It's worth noting that individual strength, skill level, and personal preference can also influence how a katana is wielded. Experienced practitioners may develop their own variations and adaptations based on their training and style.

If you are interested in learning how to handle a katana or any bladed weapon, it is recommended to seek proper training from qualified instructors who can teach you the appropriate techniques, safety protocols, and cultural context associated with the use of these weapons.

Always prioritize safety and follow the laws and regulations of your jurisdiction when handling or using any weapon.